#include ; using namespace std; int main (){ int n; cin >> n; char c1 = 'A'; for ( int i = 0; i < n; i++ ){ char c2 = c1; for ( int j = 0; j < n; j++ ){ cout << c2; c2++; if ( c2 > 'Z' ) c2 = 'A'; } c1++; if ( c1 > 'Z' ) c1 = 'A'; cout << endl; } return 0; }

#include <bits/stdc++.h>
#define endl '\n'

using namespace std;

typedef long long ll;

int main() {
    int n;
    cin >> n;
    for (int i = 1; i <= n; i++) {
        for (int j = i; j < i + n; j++) {
            cout << char((j - 1) % 26 + 'A');
        }
        cout << endl;
    }
    return 0;
}

#include ; using namespace std; int main (){ int n; cin >> n; char c1 = 'A'; for ( int i = 0; i < n; i++ ){ char c2 = c1; for ( int j = 0; j < n; j++ ){ cout << c2; c2++; if ( c2 > 'Z' ) c2 = 'A'; } c1++; if ( c1 > 'Z' ) c1 = 'A'; cout << endl; } return 0; }

#include<bits/stdc++.h>
using namespace std;
int main(){
	int x;
	cin>>x;
	for(int i=0;i<x;i++){
		for(int j=i;j<i+x;j++){
			char danci=j%26+'A';
			cout<<danci;
		}
		cout<<endl;
	}
	return 0;
}